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      <h1 id="常用命令">常用命令</h1>
<pre><code class="language-sql">select version();#查看mysql版本
show engines;#查看支持哪些引擎
show global variables like &quot;%datadir%&quot;;#查看存储文件的位置
desc logs;#查看表结构
</code></pre>
<h1 id="附件">附件</h1>
<h2 id="maven">maven</h2>
<pre><code>&lt;!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java --&gt;
&lt;dependency&gt;
    &lt;groupId&gt;mysql&lt;/groupId&gt;
    &lt;artifactId&gt;mysql-connector-java&lt;/artifactId&gt;
    &lt;version&gt;5.1.19&lt;/version&gt;
&lt;/dependency&gt;

</code></pre>
<h2 id="链接符">链接符</h2>
<pre><code class="language-xml"># mysql database connection info
jdbc.mysql.driverClassName=com.mysql.jdbc.Driver
jdbc.mysql.url=jdbc:mysql://localhost:3306/test
jdbc.mysql.username=root
jdbc.mysql.password=root

</code></pre>
<h2 id="测试mysql是否连通了">测试MySql是否连通了</h2>
<pre><code class="language-java">    public static void main(String[] args) {
        try {
            Class.forName(&quot;com.mysql.jdbc.Driver&quot;);
            Connection conn = DriverManager.getConnection(
                    &quot;jdbc:mysql://localhost:3306/test&quot;, &quot;root&quot;, &quot;root&quot;);
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt
                    .executeQuery(&quot;select * from basic_person_info &quot;);
            while (rs.next()) {
                int id = rs.getInt(1);
                String name = rs.getString(2);
                String certNum = rs.getString(3);
                System.out.println(&quot;id:&quot; + id + &quot;,name:&quot; + name + &quot;,certNum:&quot;
                        + certNum);
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

</code></pre>
<h2 id="mysql的连接java代码测试">mysql的连接java代码测试</h2>
<pre><code>    @Test
    public void testJdbc(){
        String driver=&quot;com.mysql.jdbc.Driver&quot;;   //获取mysql数据库的驱动类
        String url=&quot;jdbc:mysql://localhost:3306/test&quot;; //连接数据库（kucun是数据库名）
        String name=&quot;root&quot;;//连接mysql的用户名
        String pwd=&quot;root&quot;;//连接mysql的密码
        try{
            Class.forName(driver);
            Connection conn= DriverManager.getConnection(url,name,pwd);//获取连接对象
            Statement statement = conn.createStatement();
            String sql = &quot;select * from user&quot;;
            ResultSet rs = statement.executeQuery(sql);
            while(rs.next()) {
                System.out.println(rs.getString(&quot;id&quot;)+&quot;&quot;);
            }
            conn.close();

        }catch(Exception e){
            e.printStackTrace();
        }
    }
</code></pre>
<h2 id="默认编码">默认编码</h2>
<p>查看默认编码：</p>
<pre><code>show variables like 'character%';
</code></pre>
<p>修改默认编码：
修改my.ini文件，</p>
<p><img src="972DE1DAB6164A17A4D3AE1497FBE43A" alt="clipboard"></p>
<p>修改数据库默认编码：</p>
<pre><code>alter database hibernate0909 character set utf8;
</code></pre>
<h2 id="mysql-日期加减天数">mysql 日期加减天数</h2>
<p>date_add()</p>
<p>参考：https://blog.csdn.net/asdkwq/article/details/77881850</p>
<h2 id="mysql计算连续天数mysql连续登">mysql计算连续天数，mysql连续登</h2>
<p><a href="https://fanshuyao.iteye.com/blog/2341455">https://fanshuyao.iteye.com/blog/2341455</a></p>
<h1 id="错误">错误</h1>
<h2 id="error-code-1093">Error Code: 1093</h2>
<p>Error Code: 1093. You can&rsquo;t specify target table &lsquo;score&rsquo; for update in FROM clause</p>
<pre><code>当执行以下sql语句时会出现 Error Code：1093 错误：

update car set tag = 1 where id in (select id from car where brand_id=182 and tag=0);
1
出现错误的原因是因为修改的表和查询的表是同一个表，MySQL是不允许这样做的，我们可以通过中间再查询一次来解决：

update car set tag = 1 where id in (select id from (select id from car where brand_id=182 and tag=0) As temp);
--------------------- 
原文：https://blog.csdn.net/u010657094/article/details/64439486 
</code></pre>
<h2 id="error-code-1093-you-cant-specify-target-table-student_info-for-update-in-from-clause">Error Code: 1093. You can&rsquo;t specify target table &lsquo;student_info&rsquo; for update in FROM clause</h2>
<p>这个是我们在使用update或者delete语句时，在where条件里面加入的子查询导致的。例如如下的update语句：</p>
<pre><code>update table set type = 'static' where id in (
select id from ws_product where first_name ='superman'
);
</code></pre>
<p>修改上述语句为下面这样，该问题可以解决：</p>
<pre><code>update ws_product set type = 'static' where id in (
select id form (
 select id from ws_product where first_name ='superman'
) xx
);
</code></pre>
<p>注意，这样一定要给最里面的子查询定义一个别名，不然会报另外一个错误：</p>
<p>原文：https://blog.csdn.net/xuehuagongzi000/article/details/77825579</p>
<h1 id="faq">FAQ</h1>
<h2 id="mysql界面工具">MySQL界面工具</h2>
<ul>
<li>MySQL Workbeanch</li>
<li>HeidiSQL</li>
</ul>
<h2 id="commysqljdbcdriver-和-commysqlcjjdbcdriver-的区别">com.mysql.jdbc.Driver 和 com.mysql.cj.jdbc.Driver 的区别</h2>
<pre><code class="language-txt">com.mysql.jdbc.Driver 是 mysql-connector-java 5.x版本的，
com.mysql.cj.jdbc.Driver 是 mysql-connector-java 6.x版本中的
</code></pre>
<p>参考：https://blog.csdn.net/superdangbo/article/details/78732700</p>
<h2 id="deletetruncatedrop-的区别">DELETE/TRUNCATE/DROP 的区别</h2>
<h2 id="复合索引">复合索引</h2>
<p>1、对于复合索引,在查询使用时,最好将条件顺序按找索引的顺序,这样效率最高;     select * from table1 where col1=A AND col2=B AND col3=D     如果使用 where col2=B AND col1=A 或者 where col2=B 将不会使用索引</p>
<p><a href="https://www.cnblogs.com/summer0space/p/7247778.html">https://www.cnblogs.com/summer0space/p/7247778.html</a></p>

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